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Category:   Application (Generic)  >   Guest Gear Vendors:   Lycos
Lycos HTML Gear 'Guest Gear' Web Site Guestbook Input Validation Flaw Lets Remote Users Conduct Cross-Site Scripting Attacks Against Guest Gear Users
SecurityTracker Alert ID:  1005221
SecurityTracker URL:  http://securitytracker.com/id/1005221
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Sep 15 2002
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Exploit Included:  Yes  

Description:   An input validation vulnerability was reported in the Lycos HTML Gear 'Guest Gear' guestbook service. A remote user can conduct cross-site scripting attacks against users of web sites that implement the Guest Gear service.

It is reported that a remote user can supply an e-mail address or web page URL to the Guest Gear function so that when a target user views the guestbook entry, arbitrary scripting code will be executed by the target user's browser. The code will originate from the site using Guest Gear and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

A demonstration exploit is provided:

" STYLE="expression([javascript])

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with a site using Guest Gear, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution:   No solution was available at the time of this entry.
Vendor URL:  htmlgear.lycos.com/specs/pro/guest.html (Links to External Site)
Cause:   Input validation error

Message History:   This archive entry has one or more follow-up message(s) listed below.
(Vendor Issues Fix) Re: Lycos HTML Gear 'Guest Gear' Web Site Guestbook Input Validation Flaw Lets Remote Users Conduct Cross-Site Scripting Attacks Against Guest Gear Users
The vendor has issued a fix.



 Source Message Contents

Subject:  [Full-Disclosure] Lycos HTMLGear Guestbook Script Injection Vulnerability


Lycos offers several advanced web applications through a service called
HTMLGear.  Among the services offered are guestbooks.  A vulnerability
exists in the Lycos guestbook that could enable someone to launch an attack
against visitors whose browsers supported inline CSS (IE, for example).

By specifying an e-mail address/web page URL like the following:

" STYLE="expression([javascript])

The JavaScript block will execute.  Some less-paranoid versions of the
guestbook also allow a typical IMG attack:

<IMG SRC="javascript:[javascript]">

This will yield the same results in many cases.
_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.netsys.com/full-disclosure-charter.html


 
 


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